**The Maine Senate race between Republican incumbent Susan Collins and Democratic challenger Troy Jackson remains a toss-up heading into the final weeks, with recent polling averages showing Jackson holding a slim edge or near parity among likely voters.** Multiple surveys from mid-to-late October, including those by Suffolk, InsiderAdvantage, and others, place the candidates within a few points, reflecting Maine’s blue-leaning electorate and Collins’s efforts to emphasize her bipartisan record and independence from President Trump. The fourth and final debate on October 15 featured sharp exchanges over Trump’s agenda, Supreme Court confirmations, and campaign spending, with Jackson repeatedly linking Collins to the administration while she highlighted cross-aisle work and constituent delivery. Heavy outside spending favors Collins, yet the competitive polling, ranked-choice voting dynamics, and short general-election window for Jackson have led traders to assign high probability against a Collins victory by November 2. No late-breaking development has shifted the balance decisively in either direction.